package homework.apiday07.exists01;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

public class Server {
    private ServerSocket serverSocket;
    public Server(){

        try {
            /**
             * 创建serverSocket对象
             * 作用：
             * 1.向系统申请服务端口.此端口用于客户端与服务端建立连接
             * 2.监听服务端口,一旦一个客户端连接了,就会立即创建一个Socket实例与该客户端交互
             */
            System.out.println("正在启动服务器");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void start(){
        /**
         * ServerSocket提供的重要方法,实现服务端口的监听
         * ServerSocket.accept()用于接收客户端的连接,并返回一个Socket实例用于与客户进行交互
         * 该方法是一个阻塞方法,调用后程序会卡住,直到一个客户连接为止
         */

        try {
            while (true){
                System.out.println("等待客户端连接....");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接了!");
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
        }
    }

    public class ClientHandler implements Runnable{
        private Socket socket;
        public ClientHandler(Socket socket){
            this.socket = socket;
        }

        @Override
        public void run() {
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);
                String message;
                while ((message=br.readLine())!=null){
                    System.out.println("客户端说:"+message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

}
